Menu popup: visibility, zoom sync, and tab fixes

Track menu popup visibility and propagate zoom level to the popup. Add menu_popup_visible_ flag, SendMenuPopupZoom(), and call it when creating/showing the popup and when adjusting zoom. Make CreateNewTab accept an optional URL and route popup/new-tab flows to it. Prevent per-tab child closes from triggering app shutdown by tracking closing_tab_browsers_ and adding ForgetClosingTabBrowser(). Treat MenuPopup role specially when enabling frame hit-testing.

Platform: remove usage of ApplyRoundedBrowserRegion and switch menu popup sizing to use resized client_size helpers (consolidate calculations across Win/Mac/Linux). UI: update menu-popup CSS/JS (new styling, font, zoom formatting API via NebulaMenuPopup.setZoomLevel), wire settings to use nebulaNative.postMessage for new-tab, and remove the static menu-popup.html. Misc: small chrome CSS/JS tweaks and ensure chrome state includes zoomLevel.

ui/js/menu-popup.js

@@ -18,37 +18,29 @@ function applyTheme(theme) {
 }
 
 function sendMenuCommand(cmd) {
-  if (window.electronAPI?.send) {
-    window.electronAPI.send('menu-popup-command', { cmd });
-    return;
-  }
-
   if (window.nebulaNative?.postMessage) {
     window.nebulaNative.postMessage(cmd);
   }
 }
 
-async function refreshZoom() {
-  if (!window.electronAPI?.invoke || !zoomPercentEl) return;
-  try {
-    const z = await window.electronAPI.invoke('get-zoom-factor');
-    zoomPercentEl.textContent = `${Math.round(z * 100)}%`;
-  } catch {}
+function formatZoomPercent(zoomLevel) {
+  const level = Number.isFinite(zoomLevel) ? zoomLevel : 0;
+  return `${Math.round(Math.pow(1.2, level) * 100)}%`;
 }
 
-window.electronAPI?.on?.('menu-popup-init', (payload) => {
-  applyTheme(payload?.theme);
-  refreshZoom();
-});
+function setZoomLevel(zoomLevel) {
+  if (zoomPercentEl) {
+    zoomPercentEl.textContent = formatZoomPercent(zoomLevel);
+  }
+}
+
+window.NebulaMenuPopup = { applyTheme, setZoomLevel };
 
 window.addEventListener('click', (e) => {
   const btn = e.target.closest('button[data-cmd]');
   if (!btn) return;
   const cmd = btn.getAttribute('data-cmd');
   sendMenuCommand(cmd);
-  if (cmd === 'zoom-in' || cmd === 'zoom-out') {
-    setTimeout(refreshZoom, 50);
-  }
 });
 
 window.addEventListener('keydown', (e) => {
@@ -57,4 +49,4 @@ window.addEventListener('keydown', (e) => {
   }
 });
 
-refreshZoom();
+setZoomLevel(0);